CN106662244B - The control device of lock-up clutch - Google Patents

The control device of lock-up clutch Download PDF

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Publication number
CN106662244B
CN106662244B CN201580037005.4A CN201580037005A CN106662244B CN 106662244 B CN106662244 B CN 106662244B CN 201580037005 A CN201580037005 A CN 201580037005A CN 106662244 B CN106662244 B CN 106662244B
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CN
China
Prior art keywords
clutch
torque
lock
connection
capacity
Prior art date
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Application number
CN201580037005.4A
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Chinese (zh)
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CN106662244A (en
Inventor
本间知明
神谷光平
铃木佑太
篠原到
关谷宽
荻野启
远藤泰弘
远田让
齐藤洸辉
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Nissan Motor Co Ltd
JATCO Ltd
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Nissan Motor Co Ltd
JATCO Ltd
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Publication of CN106662244A publication Critical patent/CN106662244A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/14—Control of torque converter lock-up clutches
    • F16H61/143—Control of torque converter lock-up clutches using electric control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/14—Control of torque converter lock-up clutches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D48/00—External control of clutches
    • F16D48/06—Control by electric or electronic means, e.g. of fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H59/18—Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/104—Clutch
    • F16D2500/10406—Clutch position
    • F16D2500/10412—Transmission line of a vehicle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/10—System to be controlled
    • F16D2500/104—Clutch
    • F16D2500/10443—Clutch type
    • F16D2500/1045—Friction clutch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/304—Signal inputs from the clutch
    • F16D2500/3041—Signal inputs from the clutch from the input shaft
    • F16D2500/30412—Torque of the input shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/30—Signal inputs
    • F16D2500/314—Signal inputs from the user
    • F16D2500/31406—Signal inputs from the user input from pedals
    • F16D2500/3144—Accelerator pedal position
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/704—Output parameters from the control unit; Target parameters to be controlled
    • F16D2500/70422—Clutch parameters
    • F16D2500/70426—Clutch slip
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2500/00—External control of clutches by electric or electronic means
    • F16D2500/70—Details about the implementation of the control system
    • F16D2500/708—Mathematical model
    • F16D2500/7082—Mathematical model of the clutch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H2059/145—Inputs being a function of torque or torque demand being a function of power demand of auxiliary devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H2059/147—Transmission input torque, e.g. measured or estimated engine torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/14—Control of torque converter lock-up clutches
    • F16H61/143—Control of torque converter lock-up clutches using electric control means
    • F16H2061/145—Control of torque converter lock-up clutches using electric control means for controlling slip, e.g. approaching target slip value
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H45/00—Combinations of fluid gearings for conveying rotary motion with couplings or clutches
    • F16H45/02—Combinations of fluid gearings for conveying rotary motion with couplings or clutches with mechanical clutches for bridging a fluid gearing of the hydrokinetic type

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Fluid Gearings (AREA)

Abstract

A kind of control device of lock-up clutch, have: lock-up clutch (20), it is installed in fluid torque-converter (2), which is set between driving source i.e. prime mover (1) of vehicle and automatic transmission (4)；Couple control unit (8H), it is in the connection control for switching fluid torque-converter (20) from torque-converters state to lockup state, to control the connection capacity of lock-up clutch (20) as time goes by and in a manner of increasing, wherein, with the subsidiary engine (110) driven by prime mover (1), connection control unit (8H) is in the control for carrying out increasing the connection capacity of lock-up clutch (20), in the case where the input torque inputted from prime mover (1) to fluid torque-converter (2) increases because of the load reduction of subsidiary engine (110), based on the torque increase, promote the increase of the connection capacity of lock-up clutch (20).The control device of lock-up clutch according to the present invention, the phenomenon that can reliably avoid the boosting occurred when to lockup state transition insufficient.

Description

The control device of lock-up clutch
Technical field
The present invention relates to a kind of control devices of lock-up clutch for being installed in vehicle.
Background technique
In the vehicles such as automobile, has and installed on the fluid torque-converter that Jie is loaded between engine and automatic transmission There is lock-up clutch, can reduce the vehicle of poor fuel consumption caused by the sliding because of fluid torque-converter.As the locking from The action state of clutch has and is set as the input and output interelement of fluid torque-converter to be directly connected to the lockup state of state, incite somebody to action The input and output interelement discharge completely (completely release) and via fluid carry out torque transmitting torque-converters state, by locking from Clutch is set as semi join state and maintains the slip state of defined slip state.
In the control of lock-up clutch, suitably switch these three action states according to the operating condition of vehicle, but should The switching of action mode is by making the locking pressure difference (pressure difference of the oil pressure Pr of the oil pressure Pa and release room of the application room of lock-up clutch Δ P (=Pa-Pr) couples hereinafter also referred to as lock-up clutch and presses) it changes and carries out.If increasing locking pressure differential deltap P, Then become lockup state, if reducing locking pressure differential deltap P, becomes torque-converters state.Both if locking pressure differential deltap P is set as Intermediate size then becomes slip state.
Wherein, in the case where switching from torque-converters state to lockup state, it is until rising to defined locking pressure difference Only, it is all boosted by opened loop control, later, via the sliding control of feedback control, is switched to lockup state.Thereby, it is possible to Swimmingly move to lockup state.In opened loop control in this case, made and periodically adding defined variable quantity The connection capacity of lock-up clutch increases, rise lock-up clutch connection pressure as time goes by.
But periodically makes to couple capacity increase plus defined variable quantity and make in lock-up clutch connection pressure In the control risen, in the case that air throttle (or accelerator pedal) is closed in control makes engine torque reduction, it cannot cope with It.Therefore, clutch capacity can be excessive, and the sharply decline etc. of connection impact or engine rotation occurs.Then, it proposes as follows Technology, that is, during coupling lock-up clutch, with the presumption of the output torque of the engine inputted to fluid torque-converter Value subtracts connection capacity of the resulting value of value for being equivalent to sliding torque of fluid torque-converter as lock-up clutch, to control lock The only coupled situation (patent document 1) of clutch.
But in the invention of patent document 1, pass through the lift of the accelerator pedal of driver in the output torque of engine Rise or the accelerator operation that depresses etc and in the case where increasing and decreasing, cope with, but in the accelerator behaviour for being not accompanied by driver The output torque itself made and change i.e. engine does not change, and there is a situation where fluctuate for the input torque inputted to fluid torque-converter Under, it cannot cope with.
For example, if the subsidiary engine driven by the engine such as air compressor of air-conditioning becomes halted state from action state, The output torque amount of the engine of subsidiary engine is then driven just to add on the input torque inputted to fluid torque-converter, so even if hair The output torque of motivation does not increase, and the input torque inputted to fluid torque-converter also increases.In the invention of patent document 1, by The coupled situation of lock-up clutch is controlled in based on engine output torque, therefore, cannot all be coped with anyway this In the case of to fluid torque-converter input input torque increase.It is thus impossible to avoid in the transition to this lockup state The phenomenon that the boosting of Shi Fasheng is insufficient.
In addition, since the sense of discomfort that the sharply connection of lock-up clutch assigns driver is big, accordingly, it is desirable to be able to more reliable Ground avoids.Especially the output torque of engine by accelerator pedal lift reduce in the case where, lock-up clutch The pressure coupled completely will decline because of the reduction of the input torque inputted to fluid torque-converter, so clutch capacity is excessive And sharp connection completely, the sharply decline etc. of connection impact or engine rotation occurs.It wants to reliably avoid in this way Connection impact etc..
In the invention of patent document 1, based on the throttle opening embodied from the result lifted as accelerator pedal The output torque of calculated engine controls the coupled situation of lock-up clutch, therefore, controls used oil according to connection The response lag of pressure is easy to generate lag in the control of lock-up clutch.Therefore, make lock-up clutch connection drops with Before, it is possible to connection impact etc. occurs, it is desirable to be able to more reliably avoid such unfavorable condition.
Existing technical literature
Patent document
Patent document 1:(Japan) special open 2006-162002 bulletin
Summary of the invention
The present invention is founded in view of this project, in the control device of lock-up clutch, can reliably keep away Exempt from the insufficient phenomenon of the boosting occurred when to lockup state transition as the first purpose, can reliably avoid by accelerator Pedal lifts the excessive phenomenon of caused clutch capacity as the second purpose.
(1) in order to achieve the above purpose, the control device of lock-up clutch of the invention has: lock-up clutch, It is installed in fluid torque-converter, which is set between driving source i.e. prime mover of vehicle and automatic transmission；Connection Connect control unit, the fluid torque-converter is switched from connection from torque-converters state to lockup state control when, with The mode that time passes through and increases controls the connection capacity of the lock-up clutch, wherein has by the prime mover driven Subsidiary engine, the connection control unit is in the control that the connection capacity for make the lock-up clutch increases, from the original In the case that the input torque that motivation is inputted to the fluid torque-converter increases because of the load reduction of the subsidiary engine, it is based on the torsion Square increase promotes the increase of the connection capacity of the lock-up clutch.
(2) control device of lock-up clutch is preferably provided with: input torque scavenging valve, presumption from described prime mover to The input torque of the fluid torque-converter input；Torque increases judging unit, and judgement is pushed away by the input torque scavenging valve Whether the fixed input torque increases；Couple capacity arithmetic element, with locking clutch described in defined execution cycle operation The indicated value of the connection capacity of device, the connection capacity arithmetic element includes the first operational part, with the lock-up clutch Couple capacity as time goes by and the mode that increases by the indicated value of last time plus defined variable quantity come operation this Indicated value；Second operational part leads in the case where being determined as that the input torque increases by torque increase judging unit The indicated value of last time is crossed plus variable quantity as defined in described and the variable quantity based on the torque increase come this finger of operation Indicating value, the connection control unit increase the judgement of judging unit as a result, being determined as the input torque based on the torque In the case where increase, based on this indicated value calculated by second operational part, the connection of the lock-up clutch is controlled Connect capacity, in the case where being determined as that the input torque does not increase, based on calculated by first operational part this Indicated value controls the connection capacity of the lock-up clutch.
(3) control device of lock-up clutch is preferably provided with: accelerator opening detection unit, detects adding for the vehicle Fast device aperture；Aperture reduces judging unit, and judgement is opened by the accelerator that the accelerator opening detection unit detects Whether degree reduces, and the connection capacity arithmetic element is also equipped with third operational part, determines when reducing judging unit by the aperture When reducing for the accelerator opening, which subtracts defined variable quantity by the indicated value of last time, carrys out operation sheet Secondary indicated value, the connection control unit are being determined as that the accelerator opening do not reduce and be determined as the input torque not In the case where increase, based on this indicated value calculated by first operational part, the connection of the lock-up clutch is controlled Capacity is connect, in the case where being determined as that the accelerator opening does not reduce and is determined as that the input torque increases, based on by institute This indicated value that the second operational part calculates is stated, the connection capacity of the lock-up clutch is controlled, is being determined as described add In the case that fast device aperture reduces, based on this indicated value calculated by the third operational part, control the locking from The connection capacity of clutch.
(4) the input torque scavenging valve is preferably according to the output torque of described prime mover and from described prime mover to institute The subsidiary engine driving torque of subsidiary engine supply is stated, to estimate the input torque.
(5) subsidiary engine preferably comprises the air compressor of air-conditioning.
(6) control device of another lock-up clutch of the invention has: lock-up clutch is installed in hydraulic moment changeable Device, the fluid torque-converter are set between driving source i.e. prime mover of vehicle and automatic transmission；Couple capacity arithmetic element, It is in the connection control for switching the fluid torque-converter from torque-converters state to lockup state, to increase as time goes by The connection capacity of lock-up clutch described in big mode operation；Couple control unit, based on the connection capacity calculated, Control the connection pressure of the lock-up clutch, wherein have: accelerator opening detection unit detects the acceleration of the vehicle Device aperture；Aperture reduces judging unit, determines whether the accelerator opening detected reduces；Input torque presumption is single Member estimates the input torque inputted from described prime mover to the fluid torque-converter；Torque increases judging unit, and judgement pushes away Whether the input torque made increases, and in the case where being determined as that the accelerator opening reduces, is reduced based on the aperture Amount, the connection capacity arithmetic element reduce the connection capacity of the lock-up clutch, are being determined as the accelerator opening In the case where not reducing and being determined as that the input torque increases, it is based on the torque increase, the connection capacity arithmetic element Promote the increase of the connection capacity of the lock-up clutch.
The control device of lock-up clutch according to the present invention, in the control for carrying out increasing the connection capacity of lock-up clutch When processed, in the case where the input torque inputted from prime mover to fluid torque-converter increases because of the load reduction of subsidiary engine, it is based on The torque increase promotes the increase of the connection capacity of lock-up clutch, therefore, even if the case where this input torque increases Under, it also can be avoided the phenomenon insufficient in the boosting occurred from torque-converters state to the transitional period of lockup state transition.
In addition, making locking clutch based on the aperture reduction amount by preferentially carrying out in the case where accelerator opening reduces The control that the connection capacity of device reduces can will be prevented by the excessive phenomenon of caused clutch capacity of lifting of accelerator pedal In possible trouble.
Detailed description of the invention
Fig. 1 is the drive system indicated using one of the present invention vehicle of the control device of the lock-up clutch of embodiment With the monolithically fabricated figure of control system；
Fig. 2 be the basic control of the control device of the lock-up clutch of one of present invention embodiment is illustrated when Between scheme；
Fig. 3 is the connection capacity of the lock-up clutch in the control device of the lock-up clutch of one of present invention embodiment Operation block figure, (a) be lifted about accelerator (foot is lifted from accelerator pedal) control connection capacity operation figure, (b) it is the figure for increasing the operation of connection capacity of control and stable state control about input torque, is (c) fortune about connection capacity The figure of the operation of input torque used in calculating；
Fig. 4 is the process being illustrated to the control of the control device of the lock-up clutch of one of present invention embodiment Figure；
Fig. 5 be indicate the accelerator of the control device of lock-up clutch of one of present invention embodiment lift control when Between scheme；
Fig. 6 is to indicate that the input torque of the control device of lock-up clutch of one of present invention embodiment increases control The time diagram of (one)；
Fig. 7 is to indicate that the input torque of the control device of lock-up clutch of one of present invention embodiment increases control (secondly) time diagram；
Specific embodiment
In the following, the embodiments of the present invention will be described with reference to the drawings.
In addition, a kind of embodiment as shown below only illustration, in following implementation, do not exclude unknown The intention of the application of the various modifications or technology shown.
Firstly, the drive system and control to the vehicle of the control device for the lock-up clutch for applying present embodiment are The composition of system is illustrated.In addition, in the present embodiment, illustration is to apply Belt-type Adjustable-speed in automatic transmission The embodiment of device (hereinafter also referred to as belt CVT or referred to as CVT) can also be using annular CVT etc. as automatic transmission Other stepless transmissions, step change transmission.
[total system composition]
Fig. 1 is the composition figure for indicating the drive system and control system of the vehicle of present embodiment.
As shown in Figure 1, the drive system of vehicle has: driving source i.e. engine (prime mover, internal combustion engine) 1, hydraulic moment changeable Device 2, forward-reverse switching mechanism 3, band type stepless speed changing mechanism (automatic transmission) 4, terminal slowdown mechanism 5, driving wheel 6, 6.In addition, by the way that fluid torque-converter 2, forward-reverse switching mechanism 3 and band type stepless speed changing mechanism 4 to be accommodated in gearbox, Constitute variable v-belt drive (CVT) 100.
It is installed in engine 1 through air throttle on-off action or fuel cut-off movement etc. and carries out output torque control Output torque control actuator 10.Control of the engine 1 except the output torque that accelerator operation is realized by the driver as a result, It, can also be based on the control for carrying out output torque from external engine control signal other than system.
Fluid torque-converter 2 is the starting element that there is torque to increase function, has lock-up clutch 20, the lock-up clutch 20 when not needing torque increase function, can be defeated by engine output shaft 11 (=fluid torque-converter input shaft) and fluid torque-converter Shaft 21 is directly connected to.The fluid torque-converter 2 with link via converter cover 22 and engine output shaft 11 impeller of pump 23, The stator 26 of shell is set to the turbine 24 of the connection of Output Shaft of Hydraulic Torque Converter 21, via one-way clutch 25 to want to constitute Element.
In addition, state or operating condition of the lock-up clutch 20 according to vehicle, being switched control is lockup state (clutch Complete coupled situation), unlocked state (the complete release conditions of clutch), sliding lockup state (clutch slip coupled situation, Although that is, having rotational speed difference on the rotary part of the input side of lock-up clutch and the rotary part of outlet side but can be from input side Any one of to the state of outlet side transmitting torque).
Clutch clamping force, that is, clutch torque transmitting under the switching control and lockup state or sliding lockup state The control of capacity is carried out by the control for oil feed pressure supplied to lock-up clutch 20.This is locking clutch for oil feed pressure The pressure difference of the Liang Ge hydraulic chamber (not shown) of the front and back of device 20, that is, apply the fluid torque-converter supply pressure Pa and release room of room Pressure difference (locking pressure difference) Δ P (=Pa-Pr) of fluid torque-converter release pressure Pr, because what is controlled is the connection of lock-up clutch 20 It connects (also comprising sliding connection), so also referred to as lock-up clutch connection pressure.
Forward-reverse switching mechanism 3 is that the input direction of rotation that will be inputted to band type stepless speed changing mechanism 4 switches to advance The mechanism of the reverse direction of forward rotation direction and retrogressing when driving when driving.The forward-reverse switching mechanism 3 has double pinion Formula planetary gear 30, the forward clutch 31 being made of multiple clutch-plates (advanced side friction coupling element), by multiple brake(-holder) blocks The reverse brake 32 (retreating side friction coupling element) of composition.
Forward clutch 31 is coupled when D keeps off the selection of the advances traveling gear such as (driving gear) by advance clutch pressure Pfc. Reverse brake 32 presses Prb to couple when retreating traveling to keep off is the selection of R gear (retreating gear) by retreating to brake.In addition, preceding All pass through into clutch 31 and reverse brake 32 when N keeps off the selection of (neutral gear, non-traveling gear) excretion advance clutch pressure Pfc and Braking pressure Prb is retreated to discharge.
Band type stepless speed changing mechanism 4, which has through the change with contact diameter, keeps transmission input and speed changer defeated The ratio between revolving speed is the stepless shift function that gear ratio infinitely changes out, has primary pulley 42, secondary pulley 43, band 44.Just Grade belt wheel 42 is made of fixed pulley 42a and sliding belt wheel 42b, and sliding belt wheel 42b is by importeding into the primary of primary pressure chamber 45 It presses Ppri and is axially moveable.Secondary pulley 43 is made of fixed pulley 43a and sliding belt wheel 43b, and sliding belt wheel 43b is by leading Enter the secondary pressure Psec to secondary pressure chamber 46 and is axially moveable.
The fixed pulley 42a of primary pulley 42 and each opposite surface, that is, pulley face and the secondary pulley 43 for sliding belt wheel 42b Fixed pulley 43a and each opposite surface, that is, pulley face for sliding belt wheel 43b are all in the shape of the letter V shape, the side of the two sides of band 44 and these Each pulley face contact.With the movement of sliding belt wheel 42b, 43b, by change tape 44 to primary pulley 42 and secondary pulley 43 Winding radius, to change gear ratio.
Terminal slowdown mechanism 5 be future Self-carried type stepless speed changing mechanism 4 transmission output shaft 41 speed changer output rotation Turn to slow down and assigns differential function and be transmitted to the mechanism of left and right sidesing driving wheel 6,6.The terminal slowdown mechanism 5, which is situated between, is loaded on speed changer Between output shaft 41 and left and right transmission shaft 51,51, comprising: be set to the first gear 52 of transmission output shaft 41, be set to it is lazy The second gear 53 and third gear 54 of wheel shaft 50, terminal slowdown gear 55, the differential gearing 56 with differential function.
As shown in Figure 1, the control system of the especially CVT100 in the control system of vehicle has 7 He of oil pressure cntrol unit CVT electronic control unit (CVTECU) 8.In addition, being also installed with starting for the CVT electronic control unit 8 and sent-received message Electromechanical sub-control unit (Engine ECU) 9.In addition, each electronic control unit (ECU:Electric Control Unit) 8,9 By input/output unit, built-in there are many storage device (ROM, RAM, BURAM etc.), the central processing units of control program (CPU), timer etc. is constituted.
Oil pressure cntrol unit 7 is production: the primary pressure Ppri imported to primary pressure chamber 45, time imported to secondary pressure chamber 46 Grade pressure Psec, the clutch 31 that marches forward import advance clutch pressure Pfc, brake 32 of drawing back import retrogressing braking pressure Prb, The control unit of the electromagnetism pressure Psol imported to locking control valve 78.The oil pressure cntrol unit 7 has oil pump 70 and oil pressure cntrol Circuit 71, oil pressure control circuit 71 include main piezoelectricity magnetic coil 72, primary piezo magnetic coil 73, secondary piezoelectric magnetic coil 74, preceding Into clutch pressure electromagnetic coil 75, retreat braking piezoelectricity magnetic coil 76, locking electromagnetic coil 77.
Main piezoelectricity magnetic coil 72 is indicated according to the main pressure exported from CVTECU8, will be adjusted from the oil pressure oil of 70 force feed of oil pump To indicated main pressure PL.
Primary piezo magnetic coil 73 is according to the primary pressure instruction exported from CVTECU8, using main pressure PL as initial pressure decompression Adjust the primary pressure Ppri of instruction.
Secondary piezoelectric magnetic coil 74 is according to the secondary pressure instruction exported from CVTECU8, using main pressure PL as initial pressure decompression Adjust the secondary pressure Psec of instruction.
Advance clutch pressure electromagnetic coil 75 is indicated according to the advance clutch pressure exported from CVTECU8, using main pressure PL as just The pressure that begins decompression adjusts the advance clutch pressure Pfc to instruction.
Braking piezoelectricity magnetic coil 76 is retreated according to the retrogressing braking pressure instruction exported from CVTECU8, using main pressure PL as just The pressure that begins decompression adjusts the retrogressing braking pressure Prb to instruction.
Locking electromagnetic coil 77 makes the conduct instruction imported to locking control valve 78 by the instruction from CVTECU8 The electromagnetism of signal pressure presses Psol.Locking control valve 78 makes fluid torque-converter supply pressure using electromagnetism pressure Psol as working signal pressure It discharges and presses with fluid torque-converter, so that pressure difference, that is, locking pressure differential deltap P (Δ P of the clutch front and back hydraulic chamber of lock-up clutch 20 =Pa-Pr) become the value based on the instruction from CVTECU8.
CVTECU8 is carried out: the instruction for obtaining the main pressure of target corresponding with throttle opening etc. is output to main piezoelectricity magnet-wire The instruction for obtaining target change gear ratio according to speed or throttle opening etc. is output to primary piezo magnet-wire by the voltage-controlled system of the master of circle 72 The speed change oil pressure cntrol of circle 73 and secondary piezoelectric magnetic coil 74, will control the connection of forward clutch 31 and reverse brake 32/ The instruction of release is output to advance clutch pressure electromagnetic coil 75 and retreats the forward-reverse switching control of braking piezoelectricity magnetic coil 76, And the connection, release, sliding for exporting instruction to locking electromagnetic coil 77 and carrying out lock-up clutch 20 engage (clutch slip Connection) etc. control.
Come to CVTECU8 input: primary rotation sensor 80, secondary rotation sensor 81, secondary pressure sensor 82, Oil temperature sensor 83, engine speed sensor 84, brake switch 85, engine load sensor 86, primary pressure sensor 87, the biography of main pressure sensor 89, vehicle speed sensor 90, accelerator opening sensor 91, IS Idle Switch 92, air-conditioner controller 93 etc. Sensor information or switching information.In addition, being requested from 9 input torque information of Engine ECU to 1 output torque of engine.Here, The gear (D gear, N gear, R gear etc.) that disconnect switch (not shown) selects the operation of the gear lever by driver is examined It surveys, exports shift signal corresponding with gear.
[composition of the control device of lock-up clutch]
By the way, the control device of the lock-up clutch of present embodiment has feature in following this respect, that is, When the connection control that lock-up clutch 20 is switched from torque-converters state to lockup state, with the side of increase as time goes by The indicated value of the connection capacity (" should couple capacity " and be also referred to as " clutch capacity ") of formula operation lock-up clutch 20 (is equivalent to use In the target value of controller control pressure), it is then based on the indicated value of the connection capacity calculated, to control the connection of lock-up clutch 20 Connect pressure.
That is, the action state as lock-up clutch 20, comprising: the input and output interelement of fluid torque-converter 2 to be set as It is directly connected to the lockup state (complete coupled situation) of state, is set as discharging completely and via fluid by the input and output interelement The torque-converters state of torque transmitting is carried out, lock-up clutch 20 is set as to semi join state and maintains the input and output interelement For the slip state of defined slip state.
In the control of lock-up clutch 20, these three action states pass through change lock-up clutch connection pressure (=locking Pressure differential deltap P) it carries out, especially in formal connection control, periodically find out the torque transfer capacity of lock-up clutch 20 Couple the indicated value T of capacityLU(hereinafter, also referred to as connection capacity TLU), then according to connection capacity TLU, pass through open loop Control, to control the indicated value P that the connection of lock-up clutch is pressedLU(hereinafter, also referred to as connection pressure PLU)。
Further, since the connection capacity T of lock-up clutch 20LUP is pressed with connectionLUP is pressed with connectionLUWith connection capacity TLUIncrease and the relationship that increases (for example, linear increase) therefore, can be referring to change by preparing the chart based on the relationship Capacity T will be coupled by changing chartLUIt is transformed to connection pressure PLU.Then, P is pressed into obtained connectionLUIt is transformed to locking electromagnetic coil 77 Instruction value (locking duty ratio), pass through instruction value, control locking electromagnetic coil 77, to control the shape of lock-up clutch 20 State.
In the connection control for switching lock-up clutch 20 from torque-converters state to lockup state, make connection capacity TLU Increase as time goes by, lockup state be made from torque-converters state via slip state, but ought sharp carry out locking from When locking (connection completely) of clutch 20, connection impact will be incurred, damage the riding comfort of vehicle.Then, by locking When lockup state is made in clutch 20, the increase of torque transfer capacity is slowly carried out, the control for smoothly carrying out moving to locking is (flat It is steady to connect (smooth on) control).
The steady connection controls to both prevent connection from preferring to be quickly accomplished locking while impact, so such as Fig. 2 It is shown, P is pressed to connection firstLUIt assigns initial value (steadily connecting initial value), then increases it stepwise, thereafter ramped shaped Ground is incremented by.Steady initial value of connecting is for starting the lock-up clutch 20 of torque-converters state to attachment side and will be between clutch Gap the value of 0 or so (preventing from shaking) is made, be set as lock-up clutch 20 and become to move to the state before slip state The size of degree.
In the process (slope (ramp) control) in ramped shaped being incremented by, firstly, implementing the smaller slope of increment rate (ramp) 2 are incremented by, and thereafter, implement being incremented by for the bigger slope 1 of increment rate.By making connection pressure PLUIt is extremely slow by slope 2 Slowly increase, come the movement for the lock-up clutch 20 after attachment side starting of releiving, and actual connection crimping is waited closely to refer to Indicating value couples pressure PLU.Thereafter, if rotational speed difference (sliding revolving speed) Δ N of the input and output interelement of fluid torque-converter 2 becomes First specified value Δ N1 by slope 1, will not be taken excessive time, and make to join in connection hereinafter, be then switched to slope 1 Meet pressure PLUIncreased with can be avoided the increment rate of the appropriateness of the worry sharply coupled.In addition, the input and output of fluid torque-converter 2 The rotational speed difference of interelement be slide revolving speed Δ N be equivalent to engine speed Ne and fluid torque-converter 2 secondary speed Nt difference (= Ne-Nt).
(slope 2 and slope 1) is controlled by this slope, if the revolving speed of the input and output interelement of fluid torque-converter 2 Difference (sliding revolving speed) Δ N becomes 0 or so small connection determinating reference value (the second specified value) Δ N0 hereinafter, being then set as from cunning Shifting state is switched to the value after lockup state, makes connection pressure PLUIncrease stepwise, can reliably keep lockup state.But It is that the judgement of the lockup state carries out after being filtered to eliminate noise to the sliding revolving speed Δ N calculated.
In addition, lock-up clutch 20 holds from slip state to the torque that lock-up clutch 20 transmits that switches in of lockup state Amount (connection capacity) TLUWhen greater than the input torque Tcin inputted to fluid torque-converter 2 (that is, lock-up clutch 20) into Row depends on input torque Tcin.That is, under slip state, even if the connection capacity T of lock-up clutch 20LUDo not increase, if Input torque Tcin is reduced, then is also switched to lockup state, even if the connection capacity T of lock-up clutch 20LUIncrease, if input Torque T cin increases, then does not also switch easily to lockup state.
In particular, when there is when strongly reducing of input torque Tcin, lock-up clutch 20 will even if carrying out slope control Sharply couple, the movement for incurring vehicle changes.In the above-mentioned slope control based on opened loop control, it is difficult to avoid this vehicle Movement change, in order to avoid the sharply connection of lock-up clutch 20 caused by the reduction as this input torque Tcin, need In connection capacity TLUOperation on take in the influence as caused by the strongly reducing of input torque Tcin.
In addition, when carrying out slope control, because not cut easily to lockup state when there is the increase of input torque Tcin It changes, so causing to take excessive time in the switching to lockup state, correspondingly, the inhibitory effect of fuel consumption declines, Therefore, it is intended that avoiding it.In addition, the time only up to will not spent until lockup state, moreover, can be in lockup state and sliding The shake (abnormal vibrations) of vehicle therefore occurs in the transition state of state, it is desirable to avoid it.
The input torque Tcin inputted to lock-up clutch 20 depends on the output torque Te of engine 1, but due to starting The output torque Te of machine 1 is not only supplied to fluid torque-converter 2 (CVT100), is also supplied to the subsidiary engine 110 driven by engine 1, Therefore consider this point and input torque Tcin can not be grasped, can not achieve the rapid switching to lockup state sometimes.
The control device of this lock-up clutch is passed by lock-up clutch 20, engine load sensor 86, accelerator opening The sensors classes such as sensor 91, the signal output section 93a for exporting the signal of subsidiary engine job information, as the Functional Unit of CVTECU8 Part and the aperture that is arranged reduces determination unit (aperture reduction judging unit) 8A, input torque presumption unit (input torque scavenging valve) 8B, torque increase determination unit (torque increase judging unit) 8C, connection capacity operational part (connection capacity arithmetic element) 8D, connection Control unit (connection control unit) 8H is constituted, in connection control unit 8H, to control connection in a manner of increasing as time goes by Meet capacity TLUAbove-mentioned slope control when, carry out avoiding sharply coupling and realizing to lockup state for lock-up clutch 20 The control switched rapidly.
In the present embodiment, this is avoided the control sharply coupled from carrying out the slope 1,2 by steadily connecting in control And make connection pressure PLUImplement when the control of increase.That is, pressing P in the connection for making lock-up clutch 20LUAfter ladder-like increase, During rotation speed difference deltan N becomes to couple determinating reference value Δ N0 or less, implementation avoids sharply joining caused by being lifted by accelerator The accelerator connect lifts control.In turn, in the present embodiment, the control of Pre-handoff is being carried out by steadily connecting in control Slope 1 make connection pressure PLUImplement when the control of increase.That is, becoming slip state and fluid torque-converter 2 from lock-up clutch 20 The rotation speed difference deltan N of input and output interelement become the first specified value Δ N1 or less and rise, determine until rotation speed difference deltan N becomes connection During a reference value Δ N0 or less, implements to prevent the shake as caused by input torque increase, the input torque of Pre-handoff is promoted to increase Add control.
Aperture reduces determination unit 8A will be detected with defined control period (execution cycle) by accelerator opening sensor 91 Accelerator opening APO out is read in, and determines whether accelerator opening APO reduces.Here, by this sub-value APO of accelerator opening (n) and the difference of upper sub-value APO (n-1), that is, accelerator opening variation delta APO (=APO (n)-APO (n-1)) and threshold value Δ APO1 (wherein, Δ APO1 < 0) is compared, if accelerator opening variation delta APO is less than threshold value Δ APO1 (Δ APO < Δ APO1), then it is determined as that accelerator opening APO reduces.
Input torque presumption unit 8B estimates the input inputted from engine 1 to fluid torque-converter 2 with the defined control period Torque T cin.As described above, the output torque Te of engine 1 is fed not only to fluid torque-converter 2, it is also fed to by engine 1 The subsidiary engine 110 of driving.Then, input torque presumption unit 8B considers the action state of subsidiary engine 110 to estimate input torque Tcin.This Outside, in the present embodiment, as subsidiary engine 110, it is assumed that the air compressor of air-conditioning, but subsidiary engine 110 is not limited to this.
That is, input torque presumption unit 8B utilizes well known method disclosed in such as patent document 1, root as shown in Fig. 3 (c) According to engine speed (engine rotary speed) Ne and throttle opening TPO, the output torque of the engine at the moment is calculated Te.In addition, being calculated in the output torque Te of engine according to the action state of subsidiary engine (air compressor of air-conditioning) 110 Part (subsidiary engine driving torque) T supplied to subsidiary engine 110AC.The action state of subsidiary engine 110 passes through the letter from air-conditioner controller 93 The signal of number output section 93a is grasped.In addition, subsidiary engine driving torque TACAction state corresponding to subsidiary engine 110.Moreover, input Torque presumption unit 8B subtracts subsidiary engine driving torque T by engine output torque TeAC, to calculate input torque Tcin.
Torque increases whether determination unit 8C judgement is increased by the input torque Tcin that input torque presumption unit 8B is estimated.That is, Torque is increased determination unit 8C and is read in input torque Tcin with the defined control period, by this sub-value Tcin of input torque Tcin (n) and the difference of upper sub-value Tcin (n-1), that is, input torque variation delta Tcin (=Tcin (n)-Tcin (n-1)) and threshold Value Δ Tcin1 (wherein, Δ Tcin1 > 0) is compared, if input torque variation delta Tcin is greater than threshold value Δ Tcin1 (Δ Tcin > Δ Tcin1), then it is determined as that input torque Tcin increases.
Connection capacity operational part 8D has: the first operational part for coupling capacity when operation stable state (couples capacity fortune when stable state Calculation portion) 8e, operation torque when increasing the second operational part while increasing (torque couple capacity operational part) 8f of connection capacity, operation add Third operational part (coupling capacity operational part when accelerator opening reduces) 8g of connection capacity, each operational part when fast device aperture reduces 8e~8g is carried out operation for each defined control period (execution cycle).
First operational part 8e operation be the used stable state when input torque Tcin is in lower state when connection hold Amount.It is shown in solid such as Fig. 3 (b) in first operational part 8e, in each control period, pass through the connection capacity T of last timeLU (n-1) defined variable quantity (a certain amount of) Δ T is addedLU1 (wherein, Δ TLU1 > 0), carry out this connection capacity T of operationLU (n).Thus obtained connection capacity TLU(n) to couple capacity when stable state, when using stable state in the case where connection capacity, connection Capacity TLU(n) increased as time goes by with certain increment rate.
Second operational part 8f operation is to couple capacity when used torque increases when input torque Tcin increases.? Second operational part 8f in each control period, passes through the connection capacity of last time as shown in the solid line of Fig. 3 (b) and double dot dash line TLU(n-1) defined variable quantity (a certain amount of) Δ T is addedLU1 (wherein, Δ TLU1 > 0), and plus based on input torque The connection volume change amount Δ T of the amendment of the increase Δ Tcin of TcinLU(Δ Tcin) carrys out this connection capacity of operation TLU(n).Thus obtained connection capacity TLU(n) couple capacity when increasing for torque, the connection capacity when increasing using torque In the case of, couple capacity TLU(n) as time goes by with than using stable state when connection capacity the case where bigger increment rate increase.
Third operational part 8g operation is connection when used accelerator opening reduces when accelerator opening APO reduces Capacity.In third operational part 8g, as shown in Fig. 3 (a), in each control period, pass through the connection capacity T of last timeLU(n-1) Subtract the connection volume change amount Δ T of the aperture reduction amount Δ APO (wherein, Δ APO < 0) based on accelerator opening APOLU(Δ APO), carry out this connection capacity T of operationLU(n).Thus obtained connection capacity TLU(n) couple when reducing for accelerator opening Capacity couples capacity T when reducing using accelerator opening in the case where connection capacityLU(n) reduce as time goes by.
Couple capacity operational part 8D based on aperture reduce determination unit 8A and torque increase determination unit 8C judgement result and In the case where being determined as that accelerator opening APO does not reduce and determines that input torque Tcin does not increase, using by the first operational part 8e Couple capacity when calculated stable state as connection capacity, is being determined as that accelerator opening APO do not reduce and be judged to inputting torsion In the case that square Tcin increases, connection capacity is used as using connection capacity when being increased by the calculated torque of the second operational part 8f, In the case where being determined as that accelerator opening APO reduces, when using being reduced by the calculated accelerator opening of third operational part 8g Couple capacity as connection capacity.
Couple control unit 8H based on the connection capacity T calculated by connection capacity operational part 8DLU, control lock-up clutch 20 Connection press PLU.That is, in connection control unit 8H, it is being determined as that accelerator opening APO do not reduce and be determined as input torque Tcin In the case where not increasing, based on the indicated value calculated by the first operational part 8e i.e. stable state when couple capacity, control locking clutch The connection capacity of device 20, in the case where being determined as that accelerator opening APO does not reduce and is determined as that input torque Tcin increases, base Couple capacity when the indicated value calculated by the second operational part 8f i.e. torque increases, the connection of control lock-up clutch 20 is held Amount, in the case where being determined as that accelerator opening APO reduces, based on the indicated value i.e. accelerator calculated by third operational part 8g Aperture couples capacity when reducing, control the connection capacity of lock-up clutch 20.At this moment, in connection control unit 8H, referring to not shown Transformation chart, will couple capacity TLUIt is transformed to connection pressure PLU.Then, P is pressed into obtained connectionLUIt is transformed to locking electromagnetism The instruction value (locking duty ratio) of coil 77 controls locking electromagnetic coil 77, to control lock-up clutch by the instruction value 20 state.
[functions and effects]
The control device of the lock-up clutch of present embodiment due to constituting as described above, thus it is for example possible to such as Fig. 4 Process implement the control of lock-up clutch 20 like that.In addition, the process of Fig. 4 by lock-up clutch 20 from torque-converters state to (steady to connect in control and when Δ N0≤Δ N≤Δ N1) is implemented when the connection control of lockup state switching, until connection controls Terminate, all with the repetition of defined control period.In addition, the initial value T of connection capacityLU(1) it presets and is set to and couples pressure PLUJust The corresponding value of initial value (steadily connecting initial value).
As shown in figure 4, CVTECU8 is turned round by the accelerator opening APO detected by accelerator opening sensor 91 and by input The input torque Tcin of square presumption unit 8B presumption reads in (step S10).Then, this sub-value APO (n) of accelerator opening is calculated With difference, that is, accelerator opening variation delta APO (=APO (n)-APO (n-1)) (step S20) of upper sub-value APO (n-1).
Then, reduce determination unit 8A using aperture, by accelerator opening variation delta APO and threshold value Δ APO1 (wherein, Δ APO1 < 0) it is compared, determine whether accelerator opening APO reduces (step S30).If accelerator opening variation delta APO Less than threshold value Δ APO1, then it is determined as that accelerator opening APO reduces.
If it is determined that accelerator opening APO reduces, then in connection capacity operational part 8D, passed through by third operational part 8g upper Secondary connection capacity TLU(n-1) connection of the aperture reduction amount Δ APO (wherein, Δ APO < 0) based on accelerator opening APO is subtracted Meet volume change amount Δ TLU(Δ APO) carrys out this connection capacity T of operationLU(n) (step S40).The connection calculated in this way is held Measure TLU(n) (accelerator opening couples capacity when reducing) reduces as time goes by.Then, S90 is entered step.
On the other hand, it if reducing determination unit 8A by aperture is determined as that accelerator opening APO does not reduce, calculates by defeated Enter the variation delta Tcin (step S50) for the input torque Tcin of torque presumption unit 8B presumption inputted to fluid torque-converter 2, base In input torque variation delta Tcin, determination unit 8C is increased by torque and determines whether input torque Tcin increases (step S60).
If increasing determination unit 8C by torque is determined as that input torque Tcin does not increase, passed through by the first operational part 8e upper Secondary connection capacity TLU(n-1) defined variable quantity (a certain amount of) Δ T is addedLU1 (wherein, Δ TLU1 > 0) come operation this Couple capacity TLU(n) (step S70).The connection capacity T calculated in this wayLU(n) (couple capacity when stable state) as time goes by Increased with certain increment rate.Then, S90 is entered step.
If increasing determination unit 8C by torque is determined as that input torque Tcin increases, last time is passed through by the first operational part 8e Connection capacity TLU(n-1) defined variable quantity (a certain amount of) Δ T is addedLU1 (wherein, Δ TLU1 > 0) and plus based on defeated Enter the connection volume change amount Δ T of the increase Δ Tcin of torque T cinLU(Δ Tcin) carrys out this connection capacity T of operationLU (n) (step S80).The connection capacity T calculated in this wayLU(n) (couple capacity when torque increase) as time goes by than steady Couple the bigger increment rate of capacity when state and increases.Then, S90 is entered step.
Determination unit 8C is increased by torque and is determined as that the case where input torque Tcin increases is for example by accelerator pedal Depress and the case where the output torque Te of engine 1 increase or the subsidiary engines 110 such as air compressor of air-conditioning switch from action state The case where to halted state.The case where keeping its accelerator opening after accelerator pedal depresses or after stopping subsidiary engine 110 In the case where keeping the state, in step S60, it is determined as that input torque Tcin does not increase, in step S70, passes through last time Connection capacity TLU(n-1) defined variation delta T is addedLU1 carrys out this connection capacity T of operationLU(n)。
If calculating connection capacity when accelerator opening reduces, steady in the either step in step S40, S70, S80 Couple the connection capacity T for coupling capacity when capacity or torque increase when stateLU(n), then it will couple capacity using connection control unit 8H TLUIt is transformed to connection pressure PLU(step S90), and P is pressed into obtained connectionLUIt is transformed to the instruction value of locking electromagnetic coil 77 (locking duty ratio), by the instruction value, to indicate the oil pressure state of locking electromagnetic coil 77, to control lock-up clutch 20 State (step S100).
Fig. 5 be indicate lock-up clutch 20 connection control in accelerator opening APO reduce the case where use with Connection capacity related connection capacity T when accelerator opening reducesLU(n) time diagram of the example of the case where.Such as the solid line institute of Fig. 5 Show, when in moment t11There are when lifting (reduction of accelerator opening APO) of accelerator pedal, connection pressure PLUJust at this time Accelerator opening APO reduction amount (it is every control the period reduction amount, be equivalent to reduction rate) Δ APO and decline, can avoid locking The sharply connection of clutch 20.
That is, because the output torque Te of engine 1 just declines, so to hydraulic moment changeable when accelerator opening APO reduces The input torque Tcin that device 2 inputs reduces, connection pressure P required for the connection completely of lock-up clutch 20LUDecline.Therefore, when after It is continuous to carry out making connection pressure PLUWhen the slope control increased to ramped shaped according to steady connection control, the input of fluid torque-converter 2 Rotational speed difference (sliding revolving speed) Δ N between output element is just strongly reduced, and lock-up clutch 20 sharply couples, and incurs the movement of vehicle Variation.
In contrast, in the present apparatus, since connection pressure P when there is when lifting of accelerator pedal, will be madeLUDecline, because This, can avoid the sharply connection of lock-up clutch 20.Especially because pressing P in connectionLUControl on use oil pressure, because This, even if change connection pressure PLUInstruction value, actually connection press PLUThere is also response lag (time lags) in decline, but In the present apparatus, it is not based on the decline of the output torque Te of engine 1, but based on making what input torque Tcin reduced to become defeated The reduction of the accelerator opening APO of the trigger of torque T e decline out carrys out early excise connection pressure PLUInstruction value change, can keep away Exempt from the influence of oil pressure response lag (time lag), that is, can avoid the movement variation that lock-up clutch 20 sharply couples and incurs vehicle.
In addition, since P is pressed in connectionLUSlippage (the connection capacity T of lock-up clutch 20LUSlippage) according to acceleration The size of the reduction amount Δ APO of device aperture APO and set, therefore, will not make connection pressure PLUExcessively decline, can be avoided locking The sharply connection of clutch 20, meanwhile, it is capable to until the connection of lock-up clutch 20 does not all need the superfluous time.
In the example shown in solid of Fig. 5, in moment t11, have lifting for accelerator pedal, later, accelerator pedal is protected It holds to be constant, makes connection pressure P receiving lifting for accelerator pedalLUAfter decline, again proceeds with and connected according to steady Control makes connection pressure PLUThe slope control increased to ramped shaped.It is controlled by the steady connection, in moment t12, fluid torque-converter 2 Input and output interelement rotational speed difference (sliding revolving speed) Δ N become to couple determinating reference value Δ N0 (for example, 10rpm) hereinafter, It is judged to having coupled completely in the moment lock-up clutch 20, is controlled to terminate steady connect, makes connection pressure PLUStepwise Increase.
But since the judgement of the complete connection (lockup state) is in the sliding revolving speed Δ that will be calculated to eliminate noise It is carried out after N filtering, therefore, actually becomes connection determinating reference value Δ N0 (for example, 10rpm) below in sliding revolving speed Δ N After, there are also a little time, but there is certain time lag, during this period, is becoming during connection determines completely, it is steady to connect control not Terminate.But here, if sliding revolving speed Δ N generate operation values become couple determinating reference value Δ N0 hereinafter, if forbid into Row connection pressure PLUDecline control.
In the state of sliding revolving speed Δ N and becoming connection determinating reference value Δ N0 or less, when making as shown in dash-dot lines in fig. 5 Connection pressure PLUWhen decline, engine speed Ne just increases as shown in dash-dot lines in fig. 5, and sliding revolving speed Δ N increases again.Therefore, Fluid torque-converter 2 becomes unstable state in slip state and the near border of lockup state, tends to occur shake (abnormal vibration It is dynamic).Forbid carrying out connection pressure PLUDecline control be in order to avoid such shake occurs.Therefore, such as the chain-dotted line institute of Fig. 5 Show, even if t at the time of in complete connection determines13Accelerator pedal is lifted, connection pressure PLUAlso do not decline, and be to continue with into P is pressed in the steady connection for connecting control realization of rowLURamped shaped increase, can avoid shake generation.
Fig. 6 is to indicate not having the reduction of accelerator opening APO in the connection control of lock-up clutch 20 and have by accelerating The case where increase of the engine output torque Te for depressing realization of device pedal, which couples capacity when using with torque increase, to be had The connection capacity T of passLU(n) time diagram of the example of the case where.In Fig. 6, engine speed Ne and secondary speed Nt are documented in together On one reference axis (revolving speed 0).In addition, F shown in fig. 6 is the input torque inputted to fluid torque-converter 2 in slip state Tcin increases and presses P to connectionLUIt has carried out the case where increasing amendment carrying out under (when increasing using torque the case where connection capacity) (F=1) mark risen.Here, if sliding revolving speed Δ N becomes the first specified value Δ N1 or less (moment t23), then it is switched to P is pressed to connectionLUIt carries out increasing modified control model (F=1), if sliding revolving speed Δ N becomes to couple determinating reference value Δ N0 (moment t below25), then terminate the control model (F=0).
As shown in fig. 6, for example, from the halted state of vehicle, in moment t21There is depressing for accelerator pedal, thereupon , throttle opening TPO rise, start carry out lock-up clutch 20 connection control.T at the time of later22, locking clutch The indicated value of the connection pressure of device 20 couples pressure PLURise, connection pressure PLUIt gradually increases.Then, t at the time of later23, sliding Revolving speed Δ N becomes the first specified value Δ N1 hereinafter, being switched to amendment connection pressure PLUControl model (F=1).
Connection pressure P is corrected when enteringLUControl model when, relative to the increase of engine torque Te, also generate amendment and use Connection volume change amount Δ TLU(Δ Tcin), with plus connection volume change amount Δ TLU(Δ Tcin), connection pressure PLU? Additional increase shown in dotted line.Due in moment t23Later, accelerator opening is minutely incremented by, so connection pressure PLUAddition Also very little is corrected, passes through the connection and presses PLUAdditional amendment, decline shown in dotted line to promote to slide revolving speed Δ N, locking clutch Transition of the device 20 to lockup state shifts to an earlier date.
Then, t at the time of later24, by depressing for accelerator pedal, there is the step of throttle opening to rise, therewith And come, engine torque Te increased dramatically, due to the ascending amount, the input torque inputted to correspondingly fluid torque-converter 2 Tcin also increased dramatically.At this moment, the connection volume change amount Δ T of amendmentLU(Δ Tcin) also increases, as the connection capacity becomes Change amount Δ TLUThe increase of (Δ Tcin), connection pressure PLUAlso increase shown in dotted line.
But herein when estimating engine torque Te by operation, due to be based on throttle opening and start Consider dead time or time constant on the torque value of machine revolving speed Ne and operation, therefore, the increasing of the engine torque Te deduced Add it is shown in dotted line blunt and close to actual value (practical Te), input torque Tcin is also close to actual value (practical Tcin).Therefore, Couple volume change amount Δ TLU(Δ Tcin) is also increased with gradient, connection pressure PLUAlso increased with gradient.
In this way, due to the increase of the input torque Tcin inputted to fluid torque-converter 2 correspondingly, couple volume change Measure Δ TLU(Δ Tcin) also increases, connection pressure PLUIncrease, therefore, engine speed Ne is shown in dotted line than without (real when controlling Line) quickly decline, sliding revolving speed Δ N is shown in dotted line than, faster and steadily to 0 convergence, comparing solid line without (solid line) when controlling Shown in non-controlling when locking determine moment (moment t25) locking judgement (moment t is carried out earlier25′)。
Certainly, lock-up clutch 20 can couple rapidly in the range of connection impact does not occur.In addition, working as lock-up clutch It when the state of 20 near borders in slip state and lockup state, is easy to happen shake (abnormal vibrations), but due to sliding Revolving speed Δ N stablizes decline, thus, it is also possible to avoid the generation of this shake.
That is, when input torque Tcin increases, connection pressure P required for the connection (locking) of lock-up clutch 20LUAlso increase Add, so in constant (the only Δ T of incrementssLU) when steady connection control in, the connection of only up to lock-up clutch 20 is not wanted The time is spent, and lock-up clutch 20 will become unstable state in the near border of slip state and lockup state, It is likely to occur shake.At this point, due to connection volume change amount Δ corresponding with the increase of input torque Tcin TLU(Δ Tcin) presses P to connectionLUIncrease amendment is carried out, therefore, can be avoided the generation of shake, and lock-up clutch 20 can Promptly couple (moment t25′)。
Example shown in fig. 6 inputs it is assumed that being increased by engine output torque Te itself to fluid torque-converter 2 Input torque Tcin increase the case where, i.e., the case where not changing on the action state of subsidiary engine 110 driven by the engine, But even if engine output torque Te does not increase itself, becomes in subsidiary engine 110 driven by the engine from action state and stop Only in the case where state, the input torque Tcin inputted to fluid torque-converter 2 also increases.Fig. 7 is to illustrate the time of such case Figure.
As shown in fig. 7, in moment t31, throttle opening TPO rises with depressing for accelerator pedal, starts to be locked The only connection control of clutch 20.T at the time of later32, lock-up clutch 20 becomes slip state, connection pressure PLURise, connection Meet pressure PLUIt gradually increases.Then, t at the time of later33, slide revolving speed Δ N and become the first specified value Δ N1 hereinafter, being switched to Amendment connection pressure PLUControl model (F=1).
Connection pressure P is corrected when enteringLUControl model when, relative to the increase of engine torque Te, also operation amendment is used Connection volume change amount Δ TLU(Δ Tcin), with connection volume change amount Δ TLUThe addition of (Δ Tcin) is corrected, connection Press PLUAlso additional increase shown in dotted line.In moment t33Later, because accelerator opening is minutely incremented by, connection pressure PLU Additional amendment also very little, pass through the connection and press PLUAdditional amendment, decline shown in dotted line to promote to slide revolving speed Δ N, lock Only the transition to lockup state of clutch 20 shifts to an earlier date.So far, all same as example shown in fig. 6.
T at the time of later34, subsidiary engine (air compressor for referring to air-conditioning herein) 110 becomes stopping from action state State.Because when subsidiary engine 110 driven by the engine becomes stopping from action state, in engine torque Te by subsidiary engine The amount of 110 consumption is just supplied to fluid torque-converter 2, so the input torque Tcin inputted to fluid torque-converter 2 is also correspondingly anxious Increase severely big.At this moment, the connection volume change amount Δ T of amendmentLU(Δ Tcin) also increases, with the connection volume change amount Δ TLUThe increase of (Δ Tcin), connection pressure PLUAlso shown in dotted line to increase.
In this way, due to the increase of the input torque Tcin inputted to fluid torque-converter 2 correspondingly, couple volume change Measure Δ TLU(Δ Tcin) also increases, connection pressure PLUIncrease, therefore, in this case also in this way, engine speed Ne such as dotted line It is shown quickly to decline than uncontrolled situation (solid line), revolving speed Δ N is slid shown in dotted line than uncontrolled situation (solid line) Faster and more stably to 0 convergence, locking when than non-controlling shown in solid determines moment (moment t35) locked earlier Only determine (moment t35′)。
Certainly, lock-up clutch 20 can couple rapidly in the range of connection impact does not occur.In addition, working as lock-up clutch It when the state of 20 near borders in slip state and lockup state, is easy to happen shake (abnormal vibrations), but due to sliding Revolving speed Δ N steadily declines, thus, it is also possible to avoid the generation of this shake.
That is, because when subsidiary engine 110 becomes stopping and input torque Tcin increase from action state, lock-up clutch 20 Connection (locking) required for connection pressure PLUAlso increase, so in constant (the only Δ T of incrementssLU) when steady connection In control, until the connection of lock-up clutch 20 will spend the time, but by with corresponding with the increase of input torque Tcin Meet volume change amount Δ TLU(Δ Tcin) is modified, and can be avoided the generation of shake, moreover, lock-up clutch 20 can be made fast Speed connection (moment t35′)。
Further, since steady this control for connecting control is the control completed within the limited time, therefore in this control Implementation in, as eliminate subsidiary engine 110 connection (ON), disconnect (OFF) influence method, that forbids subsidiary engine 110 connects switching It opens also very effectively.But from fuel consumption from the viewpoint of, slave action state in the on-off of subsidiary engine 110 is to stopping The switching of state is wished to carry out rapidly without delay.Then, in this control, do not forbid subsidiary engine 110 in the implementation of control Switching of the slave action state to halted state in on-off, but by the way that the switching to be reflected in control, to inhibit auxiliary Machine 110 is influenced relative to the on-off of the connection control of lock-up clutch 20.On the other hand, because subsidiary engine 110 from stopping Switching of the state to action state will not incur the rising of fuel consumption, so can forbid switching and inhibiting subsidiary engine 110 opposite It is influenced in the on-off of control.
In addition, in Fig. 6, Fig. 7, to simplify the explanation, for the cutting from slope 2 to slope 1 being illustrated in Fig. 2 It changes, do not illustrated and is illustrated, presetting slope is set as constant situation and is illustrated.
[other]
More than, embodiments of the present invention are illustrated, but the present invention is not limited to the above-described embodiments, are not being taken off In the range of spirit of that invention, various modifications can be carried out, or implement using a part.
In the above-described embodiment, increase as input torque and control, the increase to the output torque Te itself of engine 1 Caused example (Fig. 6) and subsidiary engine 110 are illustrated from connecting to example caused by the switching of disconnection (Fig. 7), but due to Input torque Tcin will be calculated according to the action state of output torque Te and subsidiary engine 110, therefore, be turned round if output occurs simultaneously Square Te increases and the switching of subsidiary engine 110, then both can be reflected in the connection volume change amount Δ T of amendmentLUOn (Δ Tcin).
In addition, in the above-described embodiment, output torque (subsidiary engine load) drop exported as engine 1 to subsidiary engine 110 Low representative example, to from subsidiary engine 110 from connecting to the increased example of input torque Tcin caused by the switching of disconnection It is illustrated, but switch for on-state from high output action state to low output action state in subsidiary engine 110 In the case of, the output torque (subsidiary engine load) of engine 1 exported to subsidiary engine 110 also reduces and input torque Tcin increases, because This can also increase control using input torque in this case.
In addition, in the above-described embodiment, making the beginning condition of this control and in the control of slope from slope 2 to slope 1 Switching it is consistent, rotation speed difference deltan N becomes the first specified value Δ N1 hereinafter, to simply forming, but these conditions are different It is fixed to need unanimously.
In addition, in the above-described embodiment, because preferentially being subtracted based on the aperture in the case where accelerator opening has reduced In a small amount, the control for reducing the connection capacity of lock-up clutch is carried out, so can avoid the sharply connection of lock-up clutch 20, The movement variation of vehicle caused by can avoid thus, still, without using the reduced control based on the accelerator opening, but only The reduction of subsidiary engine load is considered on the input torque Tcin inputted to fluid torque-converter 2 and controls the connection of lock-up clutch 20 The effect of the insufficient phenomenon of the boosting that can reliably avoid occurring when to lockup state transition also can be obtained in capacity.

Claims (6)

1. a kind of control device of lock-up clutch, has:
Lock-up clutch is installed in fluid torque-converter, the fluid torque-converter be set to vehicle driving source i.e. prime mover and from Between dynamic gear；
Couple control unit, in the connection control for switching the fluid torque-converter from torque-converters state to lockup state, To control the connection capacity of the lock-up clutch as time goes by and in a manner of increasing；
Subsidiary engine, by the prime mover driven, which is characterized in that
The connection control unit is in the control for carrying out increasing the connection capacity of the lock-up clutch, dynamic from the original In the case that the input torque that machine is inputted to the fluid torque-converter increases because of the load reduction of the subsidiary engine, it is based on the torque Increase promotes the increase of the connection capacity of the lock-up clutch.
2. the control device of lock-up clutch as described in claim 1, wherein have:
Input torque scavenging valve estimates the input torque inputted from described prime mover to the fluid torque-converter；
Torque increases judging unit, determines whether increased by the input torque that the input torque scavenging valve estimates；
Couple capacity arithmetic element, with lock-up clutch described in defined execution cycle operation connection capacity indicated value,
The connection capacity arithmetic element includes the first operational part, with the connection capacity of the lock-up clutch with the time By and the mode that increases by the indicated value of last time plus defined variable quantity come this indicated value of operation；Second operation Portion passes through the indicated value of last time in the case where being determined as that the input torque increases by torque increase judging unit In addition the defined variable quantity and variable quantity based on the torque increase be come this indicated value of operation,
The connection control unit increases the judgement of judging unit as a result, being determined as the input torque increasing based on the torque In the case where big, based on this indicated value calculated by second operational part, the connection of the lock-up clutch is controlled Capacity, in the case where being determined as that the input torque does not increase, based on this finger calculated by first operational part Indicating value controls the connection capacity of the lock-up clutch.
3. the control device of lock-up clutch as claimed in claim 2, wherein have:
Accelerator opening detection unit detects the accelerator opening of the vehicle；
Aperture reduces judging unit, whether determines the accelerator opening detected by the accelerator opening detection unit Reduce,
The connection capacity arithmetic element is also equipped with third operational part, is determined as described add when reducing judging unit by the aperture When fast device aperture reduces, which subtracts defined variable quantity by the indicated value of last time, carrys out this instruction of operation Value,
The connection control unit is being determined as that the accelerator opening do not reduce and be determined as what the input torque did not increased In the case of, based on this indicated value calculated by first operational part, the connection capacity of the lock-up clutch is controlled, In the case where being determined as that the accelerator opening does not reduce and is determined as that the input torque increases, based on being transported by described second This indicated value that calculation portion calculates controls the connection capacity of the lock-up clutch, is being determined as the accelerator opening In the case where reduction, based on this indicated value calculated by the third operational part, the connection of the lock-up clutch is controlled Connect capacity.
4. the control device of lock-up clutch as claimed in claim 2 or claim 3, wherein
The input torque scavenging valve is supplied according to the output torque of described prime mover and from described prime mover to the subsidiary engine Subsidiary engine driving torque, to estimate the input torque.
5. the control device of the lock-up clutch as described in any one of claims 1 to 3, wherein
The subsidiary engine includes the air compressor of air-conditioning.
6. a kind of control device of lock-up clutch, has:
Lock-up clutch is installed in fluid torque-converter, the fluid torque-converter be set to vehicle driving source i.e. prime mover and from Between dynamic gear；
Couple capacity arithmetic element, in the connection control for switching the fluid torque-converter from torque-converters state to lockup state When, by the connection capacity of lock-up clutch described in operation as time goes by and in a manner of increasing；
Couple control unit and the connection pressure of the lock-up clutch is controlled based on the connection capacity calculated；Accelerator Opening amount detection unit detects the accelerator opening of the vehicle；
Aperture reduces judging unit, determines whether the accelerator opening detected reduces；
Input torque scavenging valve estimates the input torque inputted from described prime mover to the fluid torque-converter；
Torque increases judging unit, determines whether the input torque deduced increases, which is characterized in that
In the case where being determined as that the accelerator opening reduces, it is based on the aperture reduction amount, the connection capacity arithmetic element Reduce the connection capacity of the lock-up clutch,
In the case where being determined as that the accelerator opening does not reduce and is determined as that the input torque increases, increased based on the torque Largely, the connection capacity arithmetic element promotes the increase of the connection capacity of the lock-up clutch.
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JPWO2016006421A1 (en) 2017-04-27
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WO2016006421A1 (en) 2016-01-14
CN106662244A (en) 2017-05-10

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